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ECG Lead System Exam |Questions &Rationales
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ECG Lead System Exam |Questions &RationalesWhat do you look at for Anterior MI? - ✔MCL1 test lead
What do you look at for Inferior MI? - ✔Lead 11
12-Lead Testing System - ✔Whole picture of heart
6 are chest
6 are limb
A Leads - ✔aVR
aVL
aVF
RA - ✔aVR
Right arm: negative deflection because the hearts electrical activity moves away from the lead
LA - ✔aVL
,Left arm: positive deflection because the hearts electrical activity moves toward the lead
LL - ✔aVF
left leg: positive deflection positive deflection because the hearts electrical activity
moves toward the lead
V1 - ✔-corresponds to modified chest lead (MCL1) placed Right side of sternum, 4th
intrcostal space
-Distinguishes between right and left ventricular topic beats
V1 shows - ✔P-wave
QRS complex
ST segment
V1 monitors: - ✔-Ventricular arrhythmia
-ST segment changes
-Bundle branch blocks
V2 - ✔Placed left of sternum, 4th intercostal rib space
V3 - ✔Placed between 2 and 4
V4 - ✔placed at 5th intercostal space and midclavicular line
V5 - ✔Place at 5th intercostal space and anterior axillaryline
, positive deflection of ECG
V6 - ✔Placed level with v4 and midaxillary line
positive deflection
Biphasic - ✔Lead V1-3
with both positive and negative deflections
P-Wave - ✔Atrial Depolarization in response to SA node triggering
Atria are stimulated and contract, they push blood through tricuspid and mitral valve into
the relaxed ventricles
height: 2-3mm
duration: 0.06-0.12 seconds
What if P-waves are absent? - ✔Can indicate that the rhythm was generated
somewhere beside the sinus node. Maybe the AV junction
P-Wave disinformation - ✔Notched, peaked or inverted: atrial enlargement associated
with COPD, pulmonary emboli, valvular disease or CHF
PR Interval - ✔Delay of AV node to allow filling of ventricle
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